Drawing press



W. KLOCKE.

DRAWING PRESS.

APPLICATION FILED APR 9, I920. 1,407,8 9, Patented Feb. 28, 1922.

i 2 SHEETS-SHEET I.

Fey. 1.

I I I INVENTOR By Attorneys,

W. KLOCKE.

DRAWING PRESS. APPLICATION FILED APR. 9, 1920.

2 SHEETSSHEET 2.

BL/INK HOLDER SLIDE INVENTOR By Attorneys,

UNITED STATES PATENT OFF-ICE.

WILLIAM KLOCKE, OF WOODI-IAVEN, NEW YORK, ASSIGNOR TOE. W- IBLISSCOMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF WEST VIRGINIA.

DRAWING PRESS.

Specification of Letters Patent.

Patented Feb. 28, 1922.

To all whom it may concern:

Be it known that I, WILLIAM KLOCKE, a citizen of the United States ofAmerica, residing in Woodhaven, in the borough and county of Queens,city and State of New York, have invented certain new and usefulImprovements in Drawing Presses, of which the following is aspecification.

This invention relates to improvements in drawing presses and aims toprovide improvements therein.

The present invention provides a drawing press of simple and compactconstruction, and having-a good disposition of the driving forces to theconnections which transmit the driving forces to the moving parts of thepress.

It further provides a drawing press in which slides, as a part ofthedriving connections, may be eliminated, the driving force. being appliedthrough links and mechanical parts having a turning movement around anaxis.

The invention further provides a drawing press wherein the connectionsbetween the punch and the reciprocatory slide, carrying the die, .(orthe blank holder), and the arrangement of such connections, is such thatthe punch acts as a balance for the slide, or vice versa.

The invention further provides a novel combination and arrangement, andsub-combinations of parts, hereinafter more fully set forth for carryingout the purposes of the invention. An embodiment of the invention isillustrated inthe accompanying drawings.

In said drawings,

Figure 1 is a side view of a drawing press, partly in section, embodyingthe present invention.

Fig. 2 is a view similar to Fig. 1, showing the press parts in positiondifferent from that in Fig. 1, the full lines showing the parts in theposition which they occupy when the punch is at the end of its workingstroke; the dot and dash line showing the parts in the position whichthey occupy when the blank-holder slide is withdrawn to its maximumextent.

Fig. 3 is a diagram illustrating the movements of the punch andreciprocatory slide. Referring to said drawings, numeral designates apunch, and 11 a slide carrying a die or blank holder, as the case maybe,-

here being shown as a die 12. Numeral 13 designates the blank holder,which may be, and 1s here shown as, fixed to the frame of the press.

The slide 11 and the punch 10 are driven in a suitable manner, eitherfrom separate parts or as here shown, from the same part, as for examplea crank pin 15. A connecting rod 17 may serve to connect the crank pinwith the punch 10 through a slide or crosshead 19.

The press conveniently has the driving force applied thereto through therotary shaft 21, the crank pin 15 being convenient- 1y attached to adisk or gear 22 fixed to said shaft 21.

Numeral 25 designates one or more rockshafts, oi" equivalent parts, suchas crank disks, bell cranks or the like, adapted, in COIIJHHCtlOII withsuitable connections 26, to reciprocate the slide 11. These connectionspreferably comprise a toggle or to gles, comprising a link 28 connectedat one end to the slide 11, and an arm 29 fixed upon the rock-shaft 25.

Numeral 3O designates a second rock-shaft or equivalent device such as acrank disk or hell crank lever having armsor the equivalent 31, 32, onearm, as for example the arm 31 being connected to the crank pin 15 bymeans of a link 35. The other arm 32 of the rock-shaft is connected to arockshaft 25 by means of a link 37 and an arm 39 fixed on saidrock-shaft 25. A link 40 serves to connect an arm 39 on one rock-shaft25, with another arm on another rock-shaft 25, where more than onerock-shaft 25 is employed, the arrangement being such as to secureuniform movement of the slide 11 at each side, The arms 32 and 37 consttute a toggle 43.

The arrangement of the connections between the slide 11 and the crankpin 15 is such as to secure a dwell of said slide during the active partof thestroke of the punch 10, which active part may be agreater or lesspart of its movement toward the die.

The axis of the crank 15 is located so that, in the extended position ofthe toggle 43, the link'35 stands at an angle of approximately 90 to thearm 31. This arrangement provides the minimum oscillation of the arm 31(consequently a minimum movement of the toggles 4.3 and 26) for amovement of the crank 15 through a considerable part of its circularmovement, as for example through about 90, thereby providing for arelative dwell of considerable duration of the slide 11. Thisarrangement provides a good disposition of the parts as regards theapplication of the forces. The thrust of the crank through theconnecting rod 35 is substantially at rightangles to the arm 31, and thetoggles 26 and 43 are substantially'straight, and hence in a positionwhere the mechanical advantage is greatly on the side of the actuatingforces, and against the reactive forces.

The angular relation of the arms 31 and 32 is not important as the axisof the crank 15 could be changed to conform to the relation of the arm31. Where, however, the connecting rod 17 is also connected to the crank15, the arms 31 and 32 should be approximately at right-angles to oneanother. By this arrangement the punch makes a rapid advance toward andagainst the blank during the time when the connections produce a dwellof the slide 11, and by suitably adjusting the axis of the shaft 21 tothe axis of the rock-shaft 30, the dwell of the slide may be made tocontinue until the crank pin 15 reaches a position in its circle wherethe punch is advanced to the maximum extent. This latter effect isaccomplished by locating the axis of the shaft 21 somewhat to one sideof a horizontal line drawn at the jointed end of the arm 31. It will beseen by reference to Fig. 1 of the drawing that the link 35 hassymmetrical positions at positions shown by the two dotted lines, andhence that the part of the movement of the crank pin 15 whichcorresponds with the period of dwell of the slide 11 approaches close tothe 270 position in its circle of movement, corresponding to the mostadvanced position of the unch.

\Vhere the connecting rods 1 and 35 are connected to the same crank, itis preferable to locate the crank-shaft 21 in the midplane of the press,inasmuch as the crank acts to pull Or push the punch most nearly in linewith its stroke.

Moreover, it will be seen that by the present invention, it is possibleto arrange the actuating mechanisms of the slide and punch in proximityto one another, so that the press is compact.

Moreover, it will be readily understood that the positions and directionof movement of the slide and the punch may be readily changed. A presswith an overhead drive and slide may be provided by simply inverting theparts, and an illustration of such is had by simply inverting Fig. 1.Moreover, where the punch is driven independently of the crank 15 towhich the rod 35 is connected, the working stroke of the punch may bemade to take place either in the direction of movement of the slide 11or contrariwise. It is preferable, however, to have the punch move in anopposite manner to the slide 11, as the punch may thereby be made toserve as a counter-weight for the slide.

Operation: The movements of the punch and slide, and the relation ofsuch movements are most clearly shown in the accompanying diagram, Fig.3. y

In the position of the part shown in Fig. 1, the punch is shown as beingupon its working stroke, and the slide 11 with the die 12 thereon asbeing in position to hold the blank against the blank-holder for thedrawing operation. As shown, the punch is arranged to strike the blankin the 180 position of the crank, and continues to draw the blank untilthe crank reaches, or nearly reaches its 270 position. Where thearrangement of the parts is such that the slide operating mechanismbegins to move the slide 11 prior to the completion of the workingstroke of the punch 10, the drawing action will stop at a point wherethe punch and slide begin to move together at the same speed. (See thefull line position of the parts Fig. 2.)

In the example shown, the slide remains substantially still from aboutthe 150 position of the crank 15 to about the 240 position of the crank.The toggles 26 and 43 are extended or straight at the 160 and 230positions of the crank pin, and between these positions, and slightly toeither side thereof, the oscillation of the rock-shaft 30 iscomparatively slight, not sufficient to effect the toggles 43 and 26sufiiciently to move the slide 11 to any comparative or objectionableextent.

At or about the same time that the punch 1.0 reaches the end of itsworking stroke, corresponding to the 270 position of the crank in Fig.1, the slide 11 begins to retire from its holding position, the retiringmovement being at first gradual and thereafter accelerated, the slidebeing most widely separated from the blank-holder 13 when the crank pin15 is in a position of about 20. The position of the connecting parts inthis position is shown by the dot and dash lines on Fig. 2. The returnmovement of the slide 11 is relatively uick, the motion, however. beingcomplete with a gradual retardation, this returnmovement of the slideoccurring between the 20 position of the crank 15, and the 150 positionthereof;

Moreover, it will be seen, where the punch and slide are connected tothe same actuat- I ingpart, that the slide 11 counter-balances the punchon its back stroke, as for example from the 270 position of the crank 15to the 20 position. While from the 20 position to the position the slidedoes not act to counter-balance the punch, nevertheless, the partsbetween this part of the movement have considerable momentum, so thatthe counter-balancing effect during this part of the motion is not soimportant. During the initial part of the downward movement of the punch10, it will act to counter-balance the slide during its approach toholding position. In the example shown, this counterbalancing of theslide would occur from the 90 position to about the 150 position of thecrank 15.

If the punch and slide were reversed, the counter-balancing effectswould be the reverse of those just described; that is the punch wouldcounter-balance the slide during the upward movement of the slide, andthe slide would counter-balance the punch during the upward movement ofthe punch.

The inventive ideas herein set forth may receive other embodiments andmechanical expressions than those herein specifically illustrated 'anddescribed.

What I claim is r l. A drawing press comprising a punch, and a die orblank-holder carrying slide, adapted to reciprocate in oppositedirections, and a driving part for said reciprocatory press parts, saiddriving part being on the side of said slide opposite said punch,connections between said driving part and said reciprocatory pressparts, one of said reciprocatory parts being adapted to act through itsconnections upon said driving means in a direction to counter-act theresistance on said driving means on the other re'biprocatory part, dueto its weight, said first named part thereby acting as a counterweightfor said other part.

2. A drawing press comprising a punch, and a die or blank-holdercarrying slide, adapted to reciprocate in opposite directions, and adriving part for said reciprocatory press parts, said driving part beingon the side of said slide opposite said punch, connections between saiddriving part and said reciprocatory press'parts, one of saidreciprocatory parts being adapted to act through its connections uponsaid driving means in a direction to counter-act the resistance on saiddriving means on the other reciprocatory part, due to its weight, saidfirst named part thereby acting as a counter-weight for said other part,said connection between said slide and said driving part comprising atoggle, whereby said slide is adapted to dwell during part of itsmovement.

3. A drawing press comprising a punch, and a die or blank-holdercarrying slide, adapted to reciprocate in opposite directions, and adriving part for said reciprocatory press parts, said driving part beingon the side of said slide opposite said punch, connections between saiddriving part and said reciprocatory press parts, one of saidreciprocatory parts being adapted to act through its connections uponsaid driving means in a direction to counter-act the resistance on saiddriving means on the other reciprocatory part, due to its weight, saidfirst named part thereby acting as a counter-weight for said other part,the connection between said slide and said driving means comprising apair of toggles at substantially right-angles to one another wherebysaid slide is adapted to dwell during part of its movement.

4. A drawing press comprising a punch, and a die'or blank-holdercarrying slide, adapted to reciprocate in opposite directions, and adriving part for said reciprocatory press parts, connections betweensaid driving part and said reciprocatory press parts, one of saidreciprocatory parts being adapted to act through its connections'uponsaid driving means in a direction to counter-act the resistance on saiddriving means of the other reciprocatory part, due to its weight, saidfirst named part thereby acting as a counter-weight, for said otherpart, said driving part comprising a crank, and the connection betweensaid slide and crank comprising a rock-shaft having an arm thereon, alink connected to said crank and arm, a second rock-shaft havingconnections with said slide, and a toggle between said first and secondrock-shafts.

5. A drawing press comprising a punch, and a die or blank-holdercarrying slide, adapted to reciprocate in opposite directions, and adriving part'for said reciprocatory press parts, connections betweensaid driving part and said reciprocatory press parts, one of saidreciprocatory parts being adapted to act through its connections uponsaid driving means in a direction to counteract the resistance on'saiddriving means of the other reciprocatory part, due to its weight, saidfirst named part thereby acting as a counter-weight for said other part,said driving part comprising a crank, and the connection between saidslide and crank comprising a rock-shaft having an arm thereon, a linkconnected to said crank and arm, and a plurality of rock-shaftsconnected to said slide, a link connection be-- tween said plurality ofrock-shafts adapted to move the rock-shafts in unison, and a toggleconnection between said first named rock-shaft and said plurality ofrock-shafts.

6. A drawing press comprising a punch, and a die or blank-holdercarrying slide. adapted to reciprocate in opposite directions, and adriving part for said reciprocatory pressparts, connections between saiddriving part and said reciprocatory press parts.

one of said reciprocatory parts being adapted first named part therebyacting as a counterweight for said other part, said driving partcomprising a crank, and the connection between said slide and crankcomprising a rock-shaft having an arm thereon, a link connected to saidcrank and arm, a second rockshaft having connections with said slide,and a toggle between said first and second rockshafts, said connectionof said punch comprising a connecting rod attached to said crank.

7. A drawing press comprising a reciprocatory slide adapted to carry ablank-holder or die, a rock-shaft, connections between said slide andsaid rock-shaft, and means for operating said rock-shaft, said meanscomprising a rock-shaft having a toggle connection with said first namedrock-shaft, a driving crank, an arm on said second named rockshaft, anda link connecting said arm to said crank, the center of said crank beinso located that said link and said arm on said second named rock-shaftare approximately at right-angles to one another in the extendedposition of said toggle between said rock-shafts.

8. A drawing press comprising a reci r0- catory slide adapted to carry ablank-ho der or die, a rock-shaft, connections between said slide andsaid rock-shaft,and means for oper ating said rock-shaft, said meanscomprisin a rock-shaft having a toggle connection wit said first namedrock-shaft, a driving crank, an arm on said second named rock-shaft, anda link connecting said arm to said crank, the center of said crank beingso located that said link and said arm on said second named. rock-shaftare approximately at right-angles to one another in the extendedposition of said toggle between said rockshafts, said crank having itsaxis of rotation in approximately the center plane of the press.

9. A drawing press comprising a reci rocatory slide adapted to carryablank-ho der or die, a rock-shaft, connections between said slide andsaid rock-shaft, and means for operating said rock-shaft, said meanscomprising a rock-shaft having a to gle connection with said first namedrock-sfiaft, a driving crank, an arm on said second named rockshaft, anda link connecting said arm to said crank, the center of said crank beingso located that said link and said arm on said second named rock-shaftare approximately at right-angles to one another in the extendedposition of said toggle between said rock-shafts, the axis of rotationof crank being so located that said crank, in its lowest position isclose to a position of said crank where said toggle is fully extended.

10. A drawing press comprisin a reciprocatory slide adapted to carry a bank-holder or die, a rock-shaft, connections between said slide and saidrock-shaft, and means for operating said rock-shaft, said meanscomprising a rock-shaft having a toggle connection with said first namedrock-shaft, a driving crank, an arm on said second named rock-shaft, anda link connecting said arm to said crank, the center of said crank beingso located that said link and said arm on said second named rock-shaftare approximately at right-angles to one another in the extendedposition of said toggle between said rock-shafts, the axis of rotationof said crank being so located that said crank in the position thereofin which said toggle is fully extended, is closer to the lowest positionof said crank than to the highest position thereof.

11. A drawing press comprising a reciprocatory slide adapted to carry ablank-holder or die, a rock-shaft, connections between said slide andsaid rock-shaft, and means for operating said rock-shaft, said meanscomprising a rock-shaft having a toggle connection with said first namedrock-shaft, a driving crank, an arm on said second named rockshaft, anda link connecting said arm to said crank, the center of said crank beingso located that said link and said arm on said second named rock-shaftare approximately at right-angles to one another in the extendedposition of said toggle between said rockshafts, said crank having itsaxis of rotation in approximately the center plane of the press, and apunch actuated by a crank motion substantially in unison with the motionof said driving crank.

12. A drawing press comprising a reciprocatory slide adapted to carry ablank-holder or die, a rock-shaft, connections between said slide andsaid rock-shaft, and means for operating said rock-shaft',-said meanscomprising a rock-shaft having a-toggle connection with said first namedrock-shaft, a driving crank, an arm on said second named rockshaft, anda link connecting said arm to said crank, the center of said crank beingso located that said link and said arm on said second named rock-shaftare approximately at right-angles to one another in the extendedposition of said toggle between said rockshafts,-the axis of rotation ofcrank being so located that said crank, in its lowest position is closeto a position of said crank where said toggle is fully extended, and apunch actuated by a crank motion substantially in unison with the motionof said driving crank.

13. A drawing press comprising a reci rocatory slide adapted to carry ablank-ho der or die, a rockshaft, connections between said slide andsaid rock-shaft, and means for operating sai rock-shaft, said meanscomprisin a rock-shaft having a toggle connection with said first namedrock-shaft, a driving crank, an arm on said second named rock-shaft, anda link connecting said arm to said crank, the center of said crank beingso located that said link and said arm on said second named rock-shaftare approximately at right angles to One another in the extend edposition of said toggle between said rockshafts, the axis of rotation ofsaid crank be ing so located that said crank in the position thereof inwhich said toggle is fully extended, is closer to the lowest position ofsaid crank than to the. highest position thereof, and a punch actuatedby a crank motion substantially in unison with the motion of saiddriving crank.

14. A ress comprising a blank-holder or die carrylng slide, and meansfor reciprocating the same, said means comprising three seriallyconnected rocking parts, a rotary part, a link between said rotary partand one of said rocking parts for rocking the same and separateconnections between each of said other rocking parts and said slide.

15. A press comprising a blank-holder or die carrying slide, and meansfor reciprocating the same, said means comprising three seriallyconnected rocking parts, a rotary part, a link betweensaid rotary partand one of said rocking parts for rocking the same,

i said rocking parts being connected by a toggle and separateconnections between each of said other rocking partswand said slide.

16. A press comprising a. blank-holder or die carrying slide, and meansfor reciprocating the same, said means comprising three seriallyconnected rocking parts, a rotary part, and a link between said rotarypart and one of said rocking parts for rocking the same, a toggleconnecting said lastnamed rocking part and the next rocking part in theseries, and a toggle connecting said slide and each of the last two rockshaftsin the series.

17. A press comprising a blank-holder or die carrylng slide, and meansfor reciprocating the same, said means comprising two serially connectedrocking parts, a rotary part, and a. link between said rotary part andone of said rocking parts for rocking the same, said rocking parts beingconnected by a toggle, said rotary part having an eccentric part towhich said link is connected, said eccentric part being arranged to turnthrough that part of its movement which is substantially across the lineof reciprocation of said link, when the pivots of said toggle aresubstantially in alinement.

18. A press comprising a blank-holder or die carrying slide, and meansfor reciprocating the same, said means comprising two serially connectedrocking parts, a rotary part, and a link between said rotary part andone of said rocking parts for rocking the same, said rocking parts beingconnected by a toggle, said rotary part having an eccentric part towhich said link is connected, said eccentric part being arranged to turnthrough that part of its movement which is substantially across the lineof reciprocation of said link, when the pivots of said toggle aresubstantially in alinement,

and a toggle connecting said slide and a rock-shaft, said latter togglehaving its pivots in alinement simultaneously with the alinement of thepivots of the first-mentioned toggle. 1

19. A press comprising a blank-holder or die carrying slide, and meansfor reciprocating the same, said means comprising two serially connectedrocking parts, a rotary part, and a link between said rotary part andone of said rocking parts for rocking the same, said rotary part androcking parts being on the same side of said slide.

20. A press comprising a blank-holder or die carrying slide, and meansfor reciprocating the same, said means comprising two serially connectedrocking parts, a retary part, and a link between said rotary part andone of said rocking parts for rocking the same, said rocking parts beingconnected by a toggle, said rotary part and rocking parts being on thesame side of said slide.

21. A press comprising a blank-holder or die carrying slide, and meansfor reciprocating the same, said means comprising two serially connectedrocking parts, a rotary part, and a link between said rotary part andone of said rocking parts for rocking the same, said rocking parts beingconnected by a toggle, and a toggle connecting said slide and arock-shaft, said rotary part and rocking parts being on the same side ofsaid slide.

22.v A press comprising a blank-holder or die carrying slide, and meansfor reciprocating the same, said means comprising two serially connectedrocking parts, a rotary part, and a link between said rotary part andone of said rocking parts for rocking the same, said rocking parts beingconnected by a toggle, said rotary part having an eccentric part towhich said link is connected, said eccentric part being arranged to turnthrough that part of its movement which is substantially across the lineof reciprocation of said link, when the pivots of said toggle aresubstantially in alinement, said rotary part and rocking parts being onthe same side of said slide.

23. A press comprising a blank-holder or die carrying slide, and meansfor rec procating the same, said means comprising three seriallyconnected rocking parts, a rotary part, and a link between said rotarypart and one of said rocking parts for rocking the same, and separateconnections between each of the other two rocking parts and said slide,said rocking partsand rotary part having parallel axes.

24. A press comprising a blank-holder or die carrying slide, and meansfor reciprocating the same, said means comprising two serially connectedrocking parts, a rotary part, and a link between said rotary part andone of said rocldng parts for rocking the same, said rocking parts beingconnected by a toggle, said rotary part having an eccentric part towhich said link is connected, said eccentric part being arranged to turnthrough that part of its movement which is substantially across the lineof reci rocation of said link, when the pivots of said toggle aresubstantially in alinement, said rocking parts and rotary part havingparallel axes.

25. A press comprising a blank-holder or die carrying slide, and meansfor reciprocatin the same, said means comprising two serially connectedrocking parts, a rotary part, and a link between said rotary part andone of said rocking parts for rocking the same, said rotary part androcking parts bein on the same side of said slide, said rocklng partsand rotary part having parallel axes.

26. A press comprising a blank-holder or die carrying slide, and meansfor reciprocating the same, said means comprising two serially connectedrocking parts, a rotary part, and a link between said rotary part andone of said rocking parts for rocking the same, said rocking parts beingconnected by a toggle, said rotary part having an eccentric part towhich said link is connected, said eccentric part being arranged'to turnthrough that part of its movement which is substantially across the lineof reciprocation of said link, when the pivots of said toggle aresubstantially in alinement, said rotary part and rocking parts bein onthe same side of said slide, said rocklng parts and rotary part havingparallel axes.

27. A press comprising a blank-holder or die carrying slide, and meansfor reciprocating the same, said means comprising a pair of rockingparts, separate connections between said slide and each of said rockingparts, a driving connection between said rocking parts, another rockinpart in serial connection with one of sald first-named rocking parts,and means connected to said other rocking part for rocking the connectedpair.

28. A press comprising a blank-holder or die carrying slide, and meansfor reciprocating the same, said means comprising a pair of rockinparts, separate connections between said sfide and each of said rockingparts, a driving connection between said rocking parts, another rockinpart in serial connection with one of sald first-named rocking parts,and means connected to said other rocking part for rocking the connectedpair, said latter means comprising a rotary part having an eccentricpart thereon, and a link connecting said other rocking part and saideccentric part.

blank-holder or 29. A press comprising a die carrylng slide, and meansfor reciprocating the same, said means comprlsing a pair of rockingparts, connections between said slide and rocking parts, a drivingconnection between said rocking parts, another rocking part in serialconnection with one of said first-named rocking parts, a toggleconnecting said other rocking part and the one rocking part to which itis connected, and means connectedto said other rockin part for rockingthe connected pair, sai latter means comprising a rotary part having aneccentric part thereon, and a link connecting said other rocking partand said eccentric part, said eccentric part being arranged to turnthrough that part of its movement which is substantially across the lineof reciprocation of said link, when the pivots of said toggle aresubstantially in alinement. In witness whereof, I have hereunto signedmy name.

. WILLIAM KLOCKE.

